Crossword Genius

To take action, becoming involved in publicity campaign, would be great (5)

Ross

I believe the answer is:

super

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'be great' is the definition.
(both can mean excellent)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for super that I've seen before include "Delightful" , "Excellent; policeman" , "(Of product) of extra fine quality" , "Prefix meaning terrific or great" , "Excellent - small-part actor" .)

I've seen this clue in The Irish Times.
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